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PCE Concentration <br /> 1 <br /> 250 - <br /> 225 ---------------------------------------------------------------------------------------------------- <br /> 200 ------------------ ----------------------------------------------------------------------------------- <br /> 175 ............................ ......................................................................... <br /> 150 ............................ ...........................•----------................................... <br /> e <br /> 0 <br /> ro125 ...............•----.---- ----............---.........--------------......---------.....-----....... <br /> �i <br /> v <br /> ® 100 ------------------------------------------------------------------------ ----------------------------- <br /> V <br /> 75 ----------------------------------------------------------------------------------------------------- <br /> 50 ----------------------------------------•------------------------- -------------------------------- <br /> A <br /> 0 0 <br /> 25 ----------------------------------------------------------------- -----------------------..-.-.--- <br /> O 0 <br /> � 0 <br /> r 11/3/88 11/3189 11/3/90 1113/91 11/2/92 11/2193 11/2/94 11/2/95 11/1/96 11/1/97 <br /> Sample Date <br /> Ar!_data.xls mw12 plot 11/24/98 <br />